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LTE is a 3GPP full IP-based standard for wireless transmission systems. Due to its characteristic of high throughput, an efficient end-to-end QoS treatment is needed in order to guarantee good quality perceived by end users. LTE provides a native QoS-aware mechanism for end-to-end service delivering based on EPS bearer and QCI. Customers today may choose mobile services among different competing network...
Quality of service (QoS) in wireless mesh networks is an active area of research which is driven by the increasing demand for multimedia content delivered wirelessly. The IEEE 802.16 (WiMAX) standard identifies four classes of service targeting throughput, delay, and jitter. In this paper, we achieve two main objectives. (1) We present a routing metric sensitive to both interference and throughput...
Ethernet switches are typically found in many large-scale distributed real-time systems providing low-end transactions as well as bulk backbone routing to real-time applications. The FTT-SE protocol (Flexible Time-Triggered communication over Switched Ethernet) is a recent proposal to bypass the limitations of conventional switches in terms of real-time behavior while catering for growing requirements...
802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for constant bit rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for variable bit rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, we introduce a deterministic...
Scheduling and channel assignment algorithms to provision longer-term backhaul traffic flows in infrastructure TDMA/OFDMA Wireless Mesh Networks (WMNs) with near-perfect QoS are described. A recursive fair stochastic matrix decomposition algorithm is used to compute transmission schedules for all provisioned backhaul traffic flows between BSs. Each schedule consists of a sequence of permutations which...
In current wireless networks, channel access is controlled via either a TDMA- or a CSMA-based scheme. While usable in single-hop networks, these techniques are far from optimal and result in significant per-hop and per-packet delay an jitter. This makes multi-hop mesh networks unsuitable for several in-demand applications, including VoIP. We present a new medium access control (MAC) protocol for wireless...
The use of wireless local area networks (WLANs), as well as the proliferation of the use of multimedia applications has grown fast in recent years. Some factors affect the quality of service(QoS) received by the user. The interference is an example. This work presents an empirical study of the QoS parameters of a VoIP application in the presence of an interference network, as well as the relevance...
The efficient scheduling is crucial to QoS (quality of service) provisioning for multimedia flows. In this paper, we study on the scheduling algorithms for mobile WiMAX (worldwide interoperability for microwave access) based on IEEE 802.16e. Considering the states of queues, the channel conditions and the QoS requirements of service classes, we propose a cross-layer designed scheduling algorithm called...
This paper details the design, implementation, simulation, and testing of the Smart Radio Channel Change Protocol (CCP), a primary user avoidance technique for dynamic spectrum sharing cognitive radios in wireless communication networks. The CCP enables a digital cognitive radio to detect the presence of legacy analog or digital radios, and to facilitate channel-change procedures to use an alternate,...
Present paper defines a new methodology proposal for the study of the viability of using specific networking technologies for the broadcasted broadband (High-Definition) services in home and Extended-home redistribution. A new method for the formulation of the QoS response of the network will be presented based on the parameters that will affect in a direct way to the network behavior. This way, it...
It is well-known that TCP has difficulty in achieving desirable levels of performance in multi-hop ad hoc networks. TCP implements a loss-based congestion control mechanism for adjusting traffic in the networks. However, when TCP reacts to a loss event in a multi-hop ad hoc network, contentions raised in the IEEE 802.11 MAC layer among nodes usually becomes excessive. This problem eventually induces...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
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